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Voltage Regulator Needed to Make B Battery Eliminators More Economical fH OME-MADE current df tv ic«' h. Intended to inate II batteries, often found to be expensive because require frequent tube Even some Inferior devices are designed so that rectifier tube sometimes lasts than a hundred hours of service. Such high upkeep completely destroy the object - economy and —which animates investment in current tap device. However, there is no reason a B battery eliminator should be economical. If there is meaiiK of regulating the supplying the rectifier tube Ilia menu., they may be updated at voltage which (permits of mum filament life, provided excessive plate currant, so tlve to the filaments, is not through the tube. Vacuum tube filaments are signed to give long life at rated filament voltage. Even operated a few per cent above rated filament voltage, their life materially reduced. The vacuum tube will last but half as long If the filaments are supplied with n voltage & per cent above their rated voltage. Tube Limitations A UV 20’ A tube should not be operated with more than five volts of filament potential. When this type of tube is used with a current tap device as rectifier, it Is gener ally burned somewhat above this voltage In order that its current output may be sufficient to meet the needs of a multi tube receiver, tC B ic B l 9 (©) (©) (S) (©) d As Loud Type Can D \<a *2 as d ® d ® d ! d d d Talk ® / \\s I 5 * \ t ® EMPHASIZE That d d l O We d d d d The Leader-Tribune d 2 Job Department A d 31 d CAN SATISFACTORILY SUPPLY ANYTHING THAT IS MADE WITH d PAPER AND PRINTER’S INK ® We are equipped to promptly print special forms , loose leaf ledger sheets , and the great variety of t vork now going to out-of-Fort Valley printers T m 1 i © 1 LET’S KEEP ALL THE MONEY AT HOME WE CAN I <© VALLEY AND PEACH COUNTY m I » ■ d ® TO BUILD FORT ® 1 ® ® ® A Representative Will Call To Assist In PlanningFor Any Printing Needs. Just Phone 119 or Send ® ® Us Postal Card ® © a d d <§> ® The Leader-Tribune 0 . ® (©> ® ® Job Department (§) (§) ®®®®®®®®®®®®®®®®®®®@® ®®®®®®®®®®®®®®®®®®®<s®®®<@ 0)C©)C©X© C©X0 ®)®©)C0J©)(S)©)©)©)© THE LEADER-TRIBUNE, FORT VALLEY, GA., THURSDAY .JUNE 25, 1925. A / L I | u j , FLUCTUATIONS IN POWER LINE VOLTAGE AM f| uc t ua tions in power supply are coupled to the receiving tubes through "current supply devices. Curve A chows the voltage fluctuations an avera ge power generator, while B and C (below) show the effect of ca p ac jty arc j inductive loads upon the voltage supply, An accurate alternating current voltmeter should therefore he ap piled to the filament terminals of the rectifier tubes, in order to make certain that there is no over¬ load. Otherwise frequent tube re¬ newals will be necessary, Not only are voltage readings necessary, but a means of regula¬ tion must be provided. The step down traneformer supplying the filament voltage may be perfectly designed, in order to meet the volt¬ age requirements of the tubes when the current supply is 110 volt CO cycle alternating current, Considerable variations In line volt age fnke place constantly, which nullify the accuracy of the voltage I output of such a transformer. Kor instance, a transformer which gives 5.0 volts output at 110 volts of line supply gives an output of 5.4G volts 120. This increase is sufficient to cut the life of the average tube three-fourths, Fluctuating Currents Bad Power circuits are so designed that their voltage usually drops as the load Increases and vice versa. Kor Instance, In an industrial cltv measurement of voltage at a con¬ sumer’s residence revealed that at half a minute before twelve the voltage of supply rose from 95 to 120 volts, while just before five In the afternoon it increased from 100 to 125 volts. These wide fluctua¬ tions are disastrous to the life of vacuum tube filaments which are supplied with current through transformers from such mains un¬ less there Is means of regulating the filament voltage. During the early evening, line voltage is usually about a hun¬ dred volts; It gradually Increases through the evening so that by ten-thirty It Is up to 120 volts. Consequently, there Is no possibil¬ ity of tube economy with a current tap device, unless there Is an ac¬ curate voltmeter and a specially designed step down transformer, with various steps, so that these wide variations in supply voltage may be compensated for. This pre¬ caution is often neglected in arti¬ cles describing how to make cur¬ rent taps, and many of the com¬ mercial devices are not supplied with this desirable feature. METHODIST CHURCH Thomas H. Thomson, Pastor Sunday school 9:30 a. m., Judge H. A. Mathews superintendent. Preaching by the pastor at 11 a. m. and 8 p. m. Epworth League at 7 p. m. Prayer meeting next week at the Baptist church. To all services the public is cor¬ dially invited. Georgia’s average expenditure for her public schools and colleges is $5.30 per person a year. Forty counties in Georgia could not raise enough funds to properly educate their children if they levied a tax of 5c on the dollar on their to tal assessment. LET US EXAMINE YOUR EYES i We have built most satisfactory a following thru our scientific, ac¬ i curate eye examinations. / ,&on/ c i % OOP V* MACON OPTICAL CO. Frank H. Johnson Optometrist Macon, Georgia. Laborers Wanted for Icing Cars HIGHEST WAGES j _ Restaurant and Sleeping Quarters on Premises. PAY OFF DAILY REPORT AT ONCE Atlantic Ice & Coal Company FORT VALLEY, GEORGIA. 'u A r* «. f t l j; i\Vv v /Vr £ wlm pi til ley* .y t ftII ! *! • S : 0 t - > \ V'v.'A « V ' r E £ ■ m. Wrn \ Tn wmnm i : pi? m Wx \ ? i ! »**'•* -* Wmf-<%*** rwAT-t 3 : - Stii| smiW t A nth 1 ' d‘ « n TIC $1 1 * V i i "O Listi - a* *kiM A iMJ ir m * M p I i pBBI* ■ - 5 i > j %*^ASFALTSLATE -fimSSLES u The Shingle That Never Curls IT is to have a good roof on your home. A roof that will * easy will withstand the weather, that will always lay flat, that keep its attractive appearance. If want such a roof, insist upon getting the ‘‘shingle that you that all roofing requirements. never curls”—the shingle meets Ask us for prices and samples of the Carey Asfaltslate Shingle. It is made in three attractive colors, Blue-black, Red and Ureen. FORT VALLEY LUMBER COMPANY Fort Valley , Georgia